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# I don't understand what this question is asking for?

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Given the function f(x) = 4x - 2, determine each of the following:

ex. $${f^{-1}(4)}$$

I know this is an inverse function, but I'm not exactly sure the steps I should take. The textbook's answer is $${3 \over 2}$$.

Oct 9, 2018

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f^-1(4), f(x)=4x-2, 4=4x-2, 4x=6, x=6/4, x=3/2. So, $$f^-1(4)=\frac{3}{2}$$.

Oct 9, 2018

#1
+3836
+2
f^-1(4), f(x)=4x-2, 4=4x-2, 4x=6, x=6/4, x=3/2. So, $$f^-1(4)=\frac{3}{2}$$.